<svg xmlns="http://www.w3.org/2000/svg" 
     xmlns:xlink="http://www.w3.org/1999/xlink" font-size="80">

<linearGradient id="grad1" gradientUnits="objectBoundingBox" x1="0" y1="0" x2="1" y2="0">
  <stop id="green"   stop-color="#00dd00"   offset="0"/>
  <stop id="blue"    stop-color="#0000dd"   offset="0.5"/>
  <stop id="magenta" stop-color="magenta"   offset="1"/>
</linearGradient>
<rect x="20" y="20" width="440" height="80" fill="url(#grad1)" />

<linearGradient id="grad2" xlink:href="#grad1"/>
<rect x="20" y="150" width="440" height="80" fill="url(#grad2)" />
<text x="20" y="300" width="440" height="80" fill="url(#grad1)">gradiation</text>
<text x="20" y="400" width="440" height="80" fill="url(#grad2)">gradiation</text>

</svg>
